Mechanical movement.



B. A. ADLER.

MECHANICAL MOVEMENT.

APPLICATION man JUNE 1, 1915.

1,180,558. Patented Apr. 25,1916.

[we/270v l 27 '7 my: 29 .fl/OP 7 J /czzer UNITED STATES PATENT OFFICE.

BROR A. ADLER, OF CHICAGO, ILLINOIS, ASSIGNOB 0F ONE-HALF '10 PETER A. LORENZ, OF CHICAGO, ILLINOIS.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Patented Apr. 25, 1916.

Original application filed June 23, 1915, Serial No. 775,215. Divided and this application filed June 1, 1915.

- Serial No. 31,493.

T 0 all whom it may concern:

Be it known that I, Bnon A. ADLER, a sub ject of the King of Sweden, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specification.

My invention relates broadly to means for producing intermittent motion.

It is especially adapted as a horological motor as in use for secondary clocks, operated in response to a master clock, wherein pneumatic, electric or other suitable powertransmitting means communicates perldoic impulses to the motor mechanism to move the time-indicating hands of the secondary clock in harmony with the movement of similar hands of the master clock.

One of the objects of my invention is to provide a simple, reliable, cheap of construction, and eflicient motor.

Another ob ect of my invention is to provide, in a motor of the class described, means for periodically correcting the variations from the master clock, that may occur in the secondary clock within a given period, so as to secure exact and positive concurrence of the positions of the time-indicating hands of the secondary clock with those of the master 'clock.

Other and further objects of my invention will become readily apparent to persons skilled in the art from a consideration of the following description when taken in 7 conjunction with the drawings, wherein Figure 1 is a rear elevation of the secondary clock mechanism. Fig. 2 is a fragmentary rear elevation showing the time correcting mechanism in operation. Fig. 3 is an enlarged view of the pawls, and; Fig. 4 is a fragmentary sectional View on the-line 4:1 of Fig. 1.

In all the views the same reference characters indicate similar parts.

10 is the plate upon which the mechanism is mounted. The plate is spaced apart from the dial and is so held by separating sleeves 13. Secured to the minute arbor is an hour wheel 18 provided with 60 teeth adapted to move the minute-hand one minute at each impulse. The train of gears to connect the minute arbor and the hour arbor, as usual, is provided in the gear wheels 19-20 and the intermeshing pinions 21 and 22. This train of gears is common in all clocks and especially in secondary electrical clocks and needs no further explanation.

The teeth 23 of the ratchet wheel 18 are each provided with fore-and-aft radial surfaces and inclined or tangential end surfaces. A locking pawl 24 is pivoted as at 25 and is further provided with a laterally projecting part 26 that is adapted for engagement in the interdental space between the radial surfaces of adjacent teeth to lock the wheel against movement in either direction. It is also provided with an inclined tapered projection 27 extending laterally from the main body of the pawl toward the impulse pawl for cooperation with a similar projection from the impulse pawl.

28 is the impulse pawl provided with a similar lateral projection 29 for engagement with the projection 27 on the locking pawl. The impulse pawl is also provided with a projection 30 for engagement with the teeth 23 of the ratchet or hour wheel. The part 30 in normal position is removed or drawn back somewhat from the teeth of the wheel which it is ultimately intended to engage and the pawl-lifting part 29, in normal position, is practically in contact with the coacting part 27 of the lockin pawl. When the impulse pawl is urged orward, on its power stroke, the parts 27 and 29 engage and thereby the locking pawl is lifted from engagement with the teeth before the part 30 engages the teeth to move the wheel. When I the part 30 has moved the minute hand and wheel a distance equal to'the distance between adjacent teeth, the projection 29 of the impulse pawl will have passed by the projection 27 on the locking pawl and on the return excursion of the impulse pawl the part 29 will ride over and pass above the part 27 of the locking pawl, thereby forcibly thrustingthe lockin pawl into interdental position between a jacent teeth of the wheel 18 to'lock it. It is therefore clear that the initial movement of the impulse pawl serves first to raise the locking pawl before the wheel 18 is moved by engagement of the part 30 of the impulse pawl with any one of the teeth of the wheel. The impulse pawl is pivoted, as at 31, to a vertical arm 32 which normally rests against the stop 33. An armature 34 is pivoted to a shaft 85 which is connected to the vertical-arm 32. A spring 36 serves to hold the armature 34 and the vertical arm 32 yieldingly in the retracted position shown in Fig. 1. An electromagnet 37, in conjunction with the armature 34, is the electro-responsive device which, when energized, serves to move both of the pawls when power is applied to the wheel 18. An electromagnet 38 is provided with a responsive armature 39 which has an extended arm 40, normally resting upon one side of the armature 34.

When the electromagnet 37 is energized the armature 34 is attracted moving the vertical arm 32 to the left and thereby giving the power impulse to the impulse pawl 28. It will be observed that the first initial movement of the impulse pawl will serve to raise the locking pawl from its locked position by engagement of projection 29 of the impulse pawl, cooperating with a similar projection 27 of the locking pawl, which operation will serve to raise the locking pawl free from the teeth of the ratchet wheel and subsequently the projection 30 of the impulse pawl, will move the wheel while it is so free during a further movement of said impulse pawl. About the time the wheel has moved to the extent of the distance between two adjacent teeth, the projection 29 of the impulse pawl will have passed the projection 27 of the locking pawl and the return stroke of the impulse pawl will tend to press the locking pawl back into its former position as the part 29 rides over the part 27 in the return stroke of the impulse pawl. A spring 42 controls the impulse pawl and a similar spring 43 controls the locking pawl, but both springs act upon the locking pawl at the time the projection from the impulse pawl is riding over the similar projection on the locking pawl, and therefore the locking pawl is assured of being returned promptly to its locking position.

I have not in this application illustrated or described electrical circuits, switches, etc. whereby this secondary clock is properly operated from its master clock, the same being fully and completely illustrated and described m my application for improvements in horological motors, Serial No. 775,215 filed June 23, 1913, of which the present application is a division.

It is desirable to correct any irregularity that may exist in-the position of the time indicating hands on the secondary clock with reference to the position of similar hands on the rimary or master clock, and it is further esirable that such correction shall be made positively, preferably once every hour, and to this end I provide mechanism for this purpose consisting of levers 72 and 73, pivoted as at 74 and 75, respectively, to a stationary part of the frame.

The levers are yieldingly held in extended or open position by means of the spring 7 6. A-projection 77 on lever 72 extends into a. recess 78 on lever 73 so tliat when lever 72 is brought up to a substantially vertical position this connecting means will operate to bring lever 73 also into a vertical position parallel with the companion lever, as shown in Fig. 2. Each of the levers is provided with laterall extending parts 80 and 81 respectively, or engagement with a screw or projection 79 when the said levers are in or are approaching substantially vertical positions. Secured to the lever' 72 is an armature 83, which is responsive to the electromognet 84, to move the said levers to the vertical position shown in Fig. 2 when the said magnet is energized. When the levers are in open or extended position, substantially as shown in Fig. 1, the parts 80 and 81, which laterally extend toward the hour wheel 18 from the said levers, are removed from the path of the screw or projection 79 which is secured to the wheel. It is evident, however, that the hour wheel 18 cannot be moved so long as the locking pawl 24 is in contact between the teeth of the hour wheel 18, and to this end I provide on the lever 72 a tapered arm 90, pivoted as at 91, and elastically held in the position shown by spring 92. When the arm 72 is drawn up to the position shown in Fig. 2, the tapered end of the arm 90 passes under the projection 93 on the locking pawl 24 and under a similar projection 94 under the impulse pawl 28,'thus lifting the said pawls and permitting the wheel 18 to be turned or rotated.

By suitable electrical connections on the master clock the electromagnet 84 is energized periodically, thereby setting the secondary clock and compensating for any slight irregularities. The energization of the magnet 84 taking place at a time where the'projection 79 should be in precisely vertical position, it is evident that should the secondary clock have run slower or faster than it should, then the projection 79 will be either on the right or the left hand side of a vertical line, taken through the axis of the wheel 18, indicating that the secondary clockis either-too fast or too slow, and

when the-levers 72 and 73 are brought up 21 will drop over the rear end of arm 90 and the interdental portion 26 of the locking pawl 2-1 will immediately drop back into itslocking position between two adjacent teeth of the hour wheel 18, and the projecting arm 90 on its return movement will ride over the projection 93 on the locking pawl on its return to the normal position shown in Fig. 1, thereby preventing the possibility of moving the hour wheel 18 from the position in which it has been placed by the cooperation of the levers 72 and 73 with the projection 79.

Should it be required at any time that the secondary clock should be set by hand, I provide a manually operable means for lifting the pawls from the hour wheel 18 so that the hands of the clock, together with the hour wheel, may be freely rotated. To this end, I provide a stem 97 which takes through the frame plate 10 and the dial plate 12 of the clock, having an integral disk part 98 projecting from its inner end. The stud or stem 97 passes through the plate 10 and the dial 12, and is adapted to be rotated from the dial side by means of the screw 99. Secured to the disk 98 by means of screw 101 is a stirrup or link 100. It is slotted at its lower end and is guided by a screw 102 which takes into the slot. Near its mid-portion it is provided with a perforation 103, within which are included the lateral projections 27 and 29 of the pawls 21 and 28, respectively, so that when the link 101 is lifted the pawls 24 and 28 are lifted by contact with these projections. A friction washer 105 permits the mechanism, just described, to remain in the position in which it has been moved and therefore the hour wheel 18 will be free to be moved by turning of the minute hand until the parts have been returned to their normal positions shown in Fig. 1.

IVhile I have herein described a single embodiment of my invention for the purpose of clear disclosure, it is evident that many changes may be made in the specific structure shown without departing from the spirit and scope of my invention as defined by the appended claims.

Having described my invention, what I claim is:

1. In a device of the character described, a ratchet wheel having teeth with radial rear and front surfaces; a locking pawl having a laterally projecting part normally included between the radial surfaces of the teeth to lock the wheel against movement in either direction, and having an integral projecting lug for cooperation with the impulse pawl; an impulse pawl having an integral projecting lug to engage the cooperating lug of the locking pawl to lift the latter, and having a part to engage the teeth to move the wheel after the locking pawl has been lifted, said lugs projecting from their respective pawls at points adjacent the active ends thereof.

2. In a device of the character described, a ratchet wheel; a locking pawl for engagement between the teeth of the said wheel to lock it against movement in either direction; an impulse pawl for moving said wheel a distance equal to the distance be tween two adjacent teeth; means integral with each of said pawls for cooperative engagement to lift the locking pawl by the impulse pawl before the wheel is moved; and a stirrup surrounding said means, adapted to lift both said pawls and to retain said pawls lifted to free the ratchet wheel.

3. In a device of the character described, a ratchet wheel; a locking pawl for retaining the wheel against movement in either direction; an inclined lifting projection on the locking pawl; an impulse pawl for moving the wheel a distance equal to the distance between two adjacent teeth; a similar inclined projection on the impulse pawl for cooperation with the inclined projection on the locking pawl; means on the impulse pawl for moving said wheel, operative after the locking pawl has been lifted, by engagement of said lifting projecting means on the respective pawls.

4:. In a device of the character described, a ratchet wheel, a locking pawl having a laterally projecting part normally included between two adjacent teeth on the said pawl to lock the wheel, and having an inclined portion for cooperation with an impulse pawl; an impulse pawl having an inclined laterally projecting part to engage the cooperatingpart of the locking pawl, to lift the latter on its movement in one direction and override the same in its movement in the opposite direction, and having a part to engage the teeth on the ratchet wheel to move the said wheel after the locking pawl had been lifted.

5. In a device of the character described, a ratchet wheel; a locking pawl having a part normally included between two of the teeth of the ratchet wheel to lock the same, and having a finger inclined downwardly and forwardly to its line of movement for cooperation with a part of the impulse pawl; an impulse pawl having a similarly inclined finger to engage the finger on the locking pawl to lift the latter on movement in one direction and ride over the same when moved in the opposite direction and a ratchet wheel engaging part upon the impulse pawl to move the wheel after the locking pawl has been lifted.

6. In a device of the character described, the combination of a ratchet wheel; a locking pawl having a projecting part normally included between two'of the teeth of the ratchet wheel to lock the same, and having a finger inclined downwardly and forwardly in the direction of its movement for cooperation with a similar finger upon the im ulse pawl; an impulse pawl having a simi arly inclined finger to engage the cooperating part of the locking pawl to lift the latter on forward movement of the impulse pawl and over-ride the same on rearward movement, and having a part vto engage the teeth to move the wheel after the locking awl has been lifted, and a spring for norma 1y holding the locking pawl in resilient engagement with the ratchet wheel.

7. In a device of the character described,

the combination of a ratchet wheel; a locking pawl having a part normallly engaging the surface of the wheel to 100 the same and having a laterally projecting finger of ovate cross section, the major axis of which is inclined to the line of motion for cooperating with a part of the impulse pawl; an impulse pawl having a laterally projecting finger shaped similarly to that on the latching pawl and adapted to engage the same on forward movement to lift the locking pawl, and a part of the impulse pawl ada ted to engage the teeth to move the wheel a ter the locking pawl has been lifted.

In testimony whereof I hereunto set my hand in the presence of two subscribing witnesses.

BROR A. ADLER.

In the presence of STANLEY W. CooK, MARY F. ALLEN. 

